#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>


int main(int argc, char* argv[])
{
    int i = 1;
    int usec = atol(argv[1]);
    printf("sleep usec : %d .\n", usec);
    while(1) {
        i++;
        usleep(usec);
    }

    return 0;
};
